Trimming device for the edges of molded articles



April 12, 1949. v. NACHAZEL 'I'RIMMING DEVICE FOR THE EDGES OF MOLDEDARTICLES Filed July 23, 1945 9 Sheets-Sheet 1 April 12, 1949;

Filed July 25, 1945 V. NACHAZEL LRIMMING DEVICE FOR THE EDGES OF MOLDEDARTICLES 9 Sheets-Sheet 2 A Z 5/ j/ 9s 2 In entor van I? v Mac/ 1 R1 -LAttorney April 12, 1949. v. NACHAZEL TRIMMING DEVICE FOR THE EDGES OFMOLDED ARTICLES Filed July 23, 1945 -9 Sheets-Sheet 3 April 12, 1949. v.NACHAZEL 2,466,961

TRIMMING DEVICE FOR THE EDGES OF MOLDED ARTICLES Filed July 25, 1945 9Sheets-Sheet 4 6/ 60 I Inventor WW4? NFIGH FZEL s\ m VHCLHV v. NACHAZEL2,466,961 TRIMMING DEVICE FOR THE EDGES OF MOLDED ARTICLES April 12,1949;

9 Sheets-Sheeti Filed July 23, 1945 Ap 12, 1949. v. NACHAZEL TRIMMINGDEVICE FOR THE EDGES OF MOLDED ARTICLES 9 Sheets-Sheet 6 Filed July 23-,1945 FIG/O.

F/G/l. 10 107/05 FIG/3.

Attorney TRIMMING DEVICE FOR THE 'EDGES 7 OF MOLDED ARTICLES Filed Jul25, 1945 9 Sheets-Sheet '7 April 12, 1949. V NACHAZEL 2,466,961

April 12, 1949. v. NACHAZEL TRIMMING DEVICE FOR THE EDGES OF MOLDEDARTICLES .9 Sheets-Sheet 8 Filed July 23, 1945 mm mm E Q omwi E 8 E MWmu uh mGDf Patented Apr. 12, 1949 TRIMMING DEVICE FOR THE EDGES OFMOLDED ARTICLES Vaclav Nachazel, Maryport, England, assignor to Messrs.Hornflowa Limited, Maryport, England, a company of Great BritainApplication July 23, 1945, Serial No. 606,618 In Great Britain June 15,1944 6 Claims.

This invention relates to trimming devices for round articles such asdiscs and buttons, particularly for moulded articles, whether of metalor plastic materials and so forth. It is the principal object of theinvention to provide a machine which will remove from the surface ofsuch articles, generally a circumferential surface, any flash or otherprojections so that the surface shall be smooth and uniform. Otherobjects are to improve the feeding of the blanks to be treated to theoperating position, to insure that the blanks are correctly presented tothe tool which operates upon them, and that they are securely held andcentred during treatment. Another object is so to arrange the mechanismthat as far as possible the parts which engage with and operate upon theblanks shall do so under spring action, their disengaging or returnmovements being positively actuated, in order that damage or breakagemay be avoided in case of obstruction due to wrong presentation ofblanks or otherwise. The invention is especially useful for removing theprojecting edges or flash from articles such as buttons moulded bycompression in open flash moulds, and it will be described in thisconnection, although the invention is not limited thereto.

The machine forming the subject of the present invention is designed toprovide a simple and inexpensive appliance which will be fully automaticin operation, will give a large output, and whose products shall besubstantially free from defects. For this purpose the machine comprisesan automatic collecting device (which may be of a known type) takingbutton blanks from a hopper and delivering them one by one to a chutewhich delivers them to a spring supporting device, this device in turnenabling the blanks to be clamped correctly in position between rotatingparts which support them while they are cut and ground or finished.Features of the device according to the invention are that each buttonin turn is separately supported between a guide and spring fingers whichserve together to deliver the blanks to a position in which they areclamped between two spindle members, immediately after which clampingthe spring fingers recede and a grindin wheel or equivalent tool isbrought into action so as to move over the edge of the blank, preferablyin a curvilinear path, smoothing the whole circumferential surfacebefore the parts of the spindle separate to release the blank. Thesupport for the grinding disc is arranged to push aside the guide duringthe grindin operation so thatit will not interfere with direct contactbetween the grinding disc and the blank. Directly the grinding isfinished the parts of the spindle separate, the grinding wheel movesbackwards, and a fresh button blank is delivered down the chute ready tobe operated on. Instead of a grinding wheel, a cutting tool or othertrimming device may be used. Again, the machine can be used as anautomatic button lathe for the production of fancy shaped buttons.

The invention is illustrated in the accompanying drawings, in which:

Figure 1 is a front view of the machine, in section on the line I-I ofFigure 3;

Figure 2 is a side elevation in section on the line IIII of Figure 1;

Figure 3 is a plan view;

Figure 4 is a detail view in elevation of the spring finger mechanismwhich delivers the blanks to the rotating holder;

Figure 5 is a plan view corresponding to-Figure 4, and

Figure 6 is an end view thereof;

Figure '7 is a detail view on an enlarged scale of the spring fingermechanism;

Figure 8 is a sectional view at right angles to Figure 7, and

Figure 9 is a plan view thereof;

Figure 10 is a detail view in elevation, and

Figure 11 is a corresponding plan view of the mechanism for holding theblanks in position while being trimmed;

Figure 12 is an enlarged sectional view of the member against which theblanks are clamped;

Figure 13 is an enlarged detail view of an indicating device to givewarning when no blank is fed to the holder;

Figure 14 shows the grinding mechanism in elevation, and

Figure 15 is a corresponding plan view thereof;

Figure 16 shows a vertical section on the line XVIXVI of Figure 15;

Figure 17 is a detail view in plan illustrating the grinding action;

Figures 18, 20, 22 and 24 are sectional elevations showing the springfinger mechanism and holding device in successive operating positions,and

Figures 19, 21, 23 and 25 are corresponding plan views showing thesuccessive positions of the grinding disc and holder;

Figure 26 is a circuit diagram;

Figure 27 is a plan View showing a modification in which the grindingdisc moves parallel to the holder for the blanks;

Figure 28 is an elevation; and

Figure 29 is a plan view showing a modification in which a cutting toolis used.

Referring to the drawings, Figures to 3, a base til has lugs 35 by whichit may be secured to a bench, and the base supports a frame 32 in whichthe machine is arranged. The cover 33 on this frame carries a bracket 34supporting the hopper 35 for containing a supply of blanks to betrimmed. In the inclined base of this hopper is a rotating pick-updevice of known type comprising a disc 35 with recesses for picking upblanks and dropping them one by one into a slot at 31 which leads to afeed chute 38. The disc 35 is rotated slowly by a worm gear 39 actuatedby chain 4! from a sprocket ll on a shaft 42. The shaft 42 in turn isdriven by a helical gear wheel 43 actuated by a helical pinion 44 on themain driving shaft 45 of the machine. The shaft 45 carries a pulley 46driven by a belt l! from an electric motor 48 mountedbeneath the base30, Figure 2.

The pick-up device consistin of the rotating disc 35 and slot 3'! is soformed that it only accepts the blanks when it picks them up with therecessed face downwards, blanks entering the recesses the other way upbeing pushed out again as the discrotates. The rate of rotation of thedisc 36 is such as to deliver blanks to the chute 38 at the rate atwhich the holding and grinding device is ready to receive them, and anindicating or warning device hereinafter described causes a lamp 50 tobe lit momentarily whenever a blank fails to be delivered for trimming.If this lamp 55 repeatedly shows the warning light it indicates to theattendant that the feed device requires attention or the hopper 35needsreplenishing. i is a lamp'which is normally alight to illuminatethe operative parts of the machine.

The blanks as they are delivered by the chute 38' fall between astationary bracket 52 and a guide member 53 which is supported by pivot54 on the said bracket. The guide member 53 is extended downwardly tostraddle the rotating shaft 55 whose end 55, Figure '8, is shaped "tofit the moulded face of the blank to be trimmed. The shaped face iscalled the fashion and will be so designated hereinafter. The shaft 55is continuously actuated by a belt 1'4! from a pulley M2 on the end ofthe main driving shaft '45, as shown in Figure 3. The arm 51 of theguide member 53 on one side of the shaft 55 is extended downwardly andhas secured thereto by bolts 58 an-extensioh 59carryinga tongue 50. Thistongue is normallypulled by a spring 6| against a screw stop 52 so as tohold the guide member 53 in its upright position as in Figure 8, but topermit it to be pushed back when required as hereinafter described moreparticularly with reference to Figures Ziand 25. The arm 51 carries achannel or chute t9 for receiving the blanks when trimmed, and afterrelease by the holding device as hereinafter described.

On the guide member 53 works a slide 63 carryingforks 64 which embracethe guide member and have pivoted thereto at 65 a plate 65 at the hackerwhich is a blade 68 terminating in spring fingers 69 for holding theblanks as they fall from chute 33 over the face of the guide member53.One blank is shown supported by the fingers 59 in Figure 8. Thefingers'have inwardly bent ends adapted to overlie the back of the blankno and to engage its curved surface but preferably not to extend overthe flash on the edge of the blank. The .blade. 68 is secured by studsill to the plate 66, and this plate carries a setscrew H which bears byits end against the guide member 53. By accurate adjustment of thesetscrew H the fingers 55 can be set so as to leave the requisiteclearance between them and the guide. member 53 for permitting theblanks 15 to 'falhdown until they rest upon the inwardly curved-lowerends of the fingers 55, in the position indicated in Figure 8. Lateralfingers 72 fixed to guide 53 by screws 13, and adjustable in angularposition when these screws are loosened, serve as lateral inclinedguides for directing the blanks into a central position as they fallbetween the guide 53 and the blade 68, down to the curved ends oi thespring fingers 59. A spring 15, attached at one end to a lug 75 securedby nut 16 to the back of the slide 53, has its other end attached to theplate Eli, and serves to pull the plate, the blade t3 and its springfingers 59 toward the guide member 53, as far as is permitted by thesetscrew H.

The slide 53 carries projecting studs ll above the cover plate and leverarms is with forked ends engage with these studs for the purpose ofraising and lowering the slide 33. The bracket 79 affixed to the slidecarries a setscrew 8b which is adjustable to determine the limit of thedownward movement of the slide as indicated in Figure 20,13 comingagainst the cover 33. The lever arms 58 are secured to a shaft 3|carried in brackets '32 and 83 from the cover 35, and on the end ofthisshaft 85 is fixed a lever 84 which extends through a slot in thecover 33. The lower end of lever 8d has a pivotal connection to a link85, whose other end is pivoted to the end of a lever '83. Lever fit issupported to turn on a post 87 depending from the cover 33, and itsother end carries a rollerSS which bears against a cam 89 fixed on avertical shaft Qt. This shaft 50 is driven by worm wheel H8 on the maindrivin shaft 55 gearing with worm 1 l9 on shaft 913, Figure 1. The link35 carries a stud '9! connected to a spring 92 whose other end isanchored by a screws'tud 93 to a wall of the frame of the machine, thisspring tending to keep the roller 88 pressed against the cam 89, and soto turn the lever arms is in the direction for lowering the slide'GE andthe spring fingers 59. This lowering can only take place when the roller83 comes upon the fiat of the cam 89 as indicated in dotted lines inFigure 5.

When the slide '53 is lowered the spring fingers 59 descend from theposition of Figure 18 to that of Figure 20 bringing the blank ill to betrimmed opposite the fashion on the end of shaft 55, and immediatelythereafter a holding device comprising a clamping member 95 movesforward and clamps the blank '50 against the fashion on the end of thecontinuously rotating shaft 55, the member $35 engaging withthe centreof the back of the blank it between the sprin fingers 69. The blank l0snaps into engagement with the fashion on the end of shaft 55 and isthus accurately centred ready for trimming. The blank isirnmediately setin rotation by contact with the fashion on the rotating shaft, and theslide 63 now rises again under the action of cam 89 while the springfingers 69 slide over the rounded rear face of the blank until theyreach the position of Figure 22, ready to receive the next blank 'ltlwhen delivered to them. as Figure 24.

The holding device or clamping member 95 is mounted and operated asindicated in Figures wand 11. It is on the reduced end of a screwstud 96adjustable in the end of a lever 91 which is split and arranged to beclamped as at 90 upon the screw 96 to lock it in its position ofadjustment, The lever 91 is mounted to turn on a vertical spindle 99which is supported in brackets I and IOI on a wall I03 of the frame 32.The lever 91 has an arm I02 projecting beyond a slot through the wallI03 and connected by a link I04 to a lever I05. This lever I05 ispivoted at I06 on a bracket I01 secured by a bolt I08 to the wall I03,and its outer end is drawn downwardly by a spring I09 connected by ascrewstud IIO to the base 30. The lever I05 also carries a roller IIIbearing on a cam II2 fixed to the shaft 90 already referred to. The cam90 holds the lever I05 in the full line position of Figure 11 over anarc of movement of rather less than 180 of the shaft 90, causing theclamping member 95 to be withdrawn. When the roller passes over theinward slope of the cam II2 the lever I05 moves to the position shown indotted lines, so advancing the clamping member 95 to engage the blankwith the fashion on the end of shaft 55, under the action of the springI09.

As the machine is fully automatic so that one operator can normally tenda number of such machines running continuously, it is desirable toprovide an indicator which will show when any machine is stopped due tojamming of a button in a chute or other cause of irregularity. For thispurpose the lever arm I02 carries a resilient tongue II3 having anelectrical connection at II 4 to a lamp circuit, while a screwstud II5mounted in insulation I34 on the base 30 is also connected in thiscircuit, as for example by a terminal I35 and conducting strip I36,indicated in Figure 13, while the contact-making end of tongue H3 isalso shown in its various relative positions, The stud H5 is so adjustedthat the end of tongue II3 does not make contact with it if clampingmember 95 is stopped by the back of a blank 10, but if no blank ispresent the clamping member moves further until tongue II3 touches theend of screwstud I I5. The circuit is as shown in Figure 26 where themembers H3 and II5 are shown as being in the circuit of the warning lamp50, supplied with current from a source at H6, and it is seen that thelamp 50 will only show a light if tongue II3 touches contact screw II5.A branch circuit from the source II6 supplies the other lamp 5I, whichserves for illuminating the machine, through a manually controlledswitch I I 1 which may be on an end wall of the machine as indicated inFigure 1.

In the example of construction illustrated, the grinding disc I'20 ismounted directly on the shaft of an electric motor I2 I which may be ofthe totally enclosed type. The base of this motor is adjustably mountedon a swinging table I23 by bolts I22 engaging as shown in slotted holesin the motor base. The table I 23 is adapted to turn in a horizontalplane about an axis I24, Figtires and 16. For this purpose a socket I43under the table may accommodate ball bearings I44 which carry it upon astud I45 capable of positional adjustment as may be required over thebase 30, to determine the position of the axis I24. Attached to thetable I23 is a spring I25 whose other end is connected to a screw studI26 aflixed to an end wall of the machine, The table is turned againstthe action of spring I25 by a link I21 passing through a slot in theinner wall of the machine and connected to one end of a lever I28 whichis pivoted on a bracket I29 on this wall, and carries a roller I30 atits other end bearing upon a cam I3I on the vertical shaft 90.

The cam I3I holds the table I23 in the full line position of Figure 15over about half of its angular movement, and then allows the table toturn slowly in a counter-clockwise direction to the position indicatedin dotted lines in that figure, during which movement the edge of thegrinding disc I20, sweeps over the edge of the blank 10 up to theposition of Figure 25, trimming it with a rounding motion which impartsa smooth finish to the edge. The table now swings back slowly, doingfurther trimming if necessary by the disc I20. The action of thegrinding disc I20 in removing fiash from a blank 10 is illustrated to anenlarged scale in Figure 17. When adjustment of the grinding disc I20 isnecessary, either to take up wear or to set it for operating on blanksof another size for example, the bolts I22 are loosened and the screwI32 engaging in a lug I33 on the side of the table is adjusted to slidethe base of the motor across the table I23 to the required extent, afterwhich the bolts I22 are tightened again.

The adjustable screw stop 62 against which the tongue 60 on theextension 59 of guide 53 bears, is on the table I23, as seen in Figures14 and 15, and as the table turns to cause the edge of the grinding discI20 to trim the edge of a blank 10, the stop 62 swings with the tableI23, so causing the whole guide 53, with its slide 63 and spring fingers69, to be pressed back, as indicated in Figures 23 and 24, in advance ofthe grinding disc I20. In this movement of course the guide 53 turnsabout its pivot at 54 as it is free to do against the action of spring6I. The space around the edge of the blank 10 is thus left clear for theadvance of the grinding disc I20, When the disc moves back the tongue 60with the guide 53 and its attachments return to the position of Figures18 and 19, ready for the next cycle of operations, under the action ofspring BI.

The fashion at 56 on the end of shaft 55 has been described hitherto asbeing formed on the shaft itself, but preferably it is formed on aspigot I31 fitted by a morse taper for example in a socket I38 on theend of the shaft 55, as

shown in Figure 12. The shaft is shown as being supported in ballbearings I 39 in a bracket I40 which projects inwardly from an end wallof the frame 32, as seen in Figure 1. The spigot I31 is thusinterchangeable with other spigots having fashions upon them shaped tocorrespond with the various shapes and sizes of blanks on which it maybe desired to operate. In general, these blanks will be button blankswith a recessed face which fits over the fashion, but any similardisc-like blanks can of course be trimmed on this machine.

In the operation of the machine as described, particularly withreference to the successive views in Figures 18 to 25, it will be clearthat when a blank 10 is fed from hopper 35* down the chute 39, it isreceived as in Figure 18 by the guide member 53 and spring fingers 69.These fingers then descend over the face of the guide 53 to the positionof Figure 20 whereupon the clamping member comes into action between thefingers 69 to hold the blank against the fashion on the end of rotatingshaft 55; the fingers 69 then recede again as in Figure 22. The tableI23 now turns causing the grinding disc I20 to move over the edge of theblank as in Figure 25, or Figure 17, while the guide member 53 is pushedback by the stop 62. The table I23 returns slowly to the position ofFigure 15 (full lines) or Figure 19, and a fresh cycle commences. Thenext blank 10" may be caused to dropinto position at anyconvenientstage, but is here shown as having dropped at the stage represented inFigure 24 while the guide 53 is pressed back by stop 52 on table 523. Asthe table returns to the position of Figures 19 and 15 (full lines) thecam H2 causes the clamping member 85 to move back, releasing the trimmedblank iii which falls down the chute 43 and into a receiving funnel Hi6,Figure 2, which directs it into a suitable receptacle (not shown).

It should be noticed particularly that, as far as is possible, all themovements involving engagement with the blank are made under springaction, the return movements being positive. Thus, the pivoting movementof the guide 53 returning it to its upright position is effected byspring 6 i; the lowering of the slide 63 and fingers 69 is to spring 92;the gripping action of the fingers 59 is exercised by spring i i; theengagement of the clamping member 95 is exercised by the spring H19; theforward movement of the table I23 with the grinding disc E29 takes placeunder the action of spring 125, while the disc is meeting and grindingaway the flash on the blank. In all these operationsif any obstructionis met with, no harm is done as the spring action permits the movingpart to hang back if obstructed.

In view of the way in which the blank is clamped, and of the way inwhich the grinding disc moves over it, there is very little risk thatthe grinding disc will displace the blank laterally because the pressureis mainly toward the face of the fashion, or along the axis of shaft 55,the lateral component being relatively smali. Moreover, as the grindingdisc E26 moves into action over substantiall the whole of its efiectivesurface during the grinding operation there is no tendency to groove itor to choke it locally with dust, and the grinding wheel will thereforeoperate continuously for long periods without redressing.

The invention has been described as applied to the trimming of the edgesof button blanks, but-if the flash or irregularities to be trimmed arenot on the edge the same machine can still be used provided that thegrinding or cutting surface is arranged to move over the plane of theflash or projection, which might for example be part way down therounded surface of the back of a button or other article. Obviously bychanging the position of the pivot pin M carrying the table I23 of thegrinding member 5% it is possible to make it move in a curvilinear pathso as to produce a rounded surface of any desired curvature, which canbe convex or concave, or a straight line motion can be used when asuitably shaped surface is to be formed or smoothed.

Figure 27 shows how the disc 2241 and motor 12W can be given a straightmotion by mounting the table M7 carrying the motor and disc to slide onthe machine base 31?, and providing a lever I48 with a pivotalconnection to a slider i552 guided between projections M9 on the tableMl for shifting it to and fro. The lever M3 is pivoted on a bracket 15!and engages the cam it on shaft 90 by means of a roller I56, while aspring i2 5 pulls the table l il in a direction to move the disc 12%over the edge of the blank. The motor is adjustable on its table as inthe first described construction by bolts l22 engaging in slots and by ascrew I32 passing through a lug I33 on the table.

The grinding disc is :only. one example of a suitable dressing tool anda blade can be used to act as a cutting tool if preferred. Figures 28and 29 show how a cutting tool can be used to serve any required purposein trimming or shaping the blank. In this case a blank Ni delivered overthe guide member 53 as before is clamped upon the end of shaft 55 and bythe member actuated as in Figures 1 to 25, and the saddle I54 carryingthe tool slides by guides I53 on the base 39 of the machine. The saddle'554 is formed with projections 549 for guiding a slide i actuated bythe same mechanism as that of Figure 27 from the cam I3| on shaft 90.The cutting tool is here shown at as a tool with a profiled face whichmay turn av correspondingly shaped or grooved face on the blank. Ofcourse if the tool I55 were shaped to move over the edge of the blank itwould trim it but witha straight line motion instead of a curvilinearone.

I claim:

1. A machine for shaping arounded edge on circular blanks comprising ashaft with'an end portion fashioned to fit against one face of eachblank, a holding member adapted to clamp a blank against such fashionedend portion, means for-rotating said shaft, means for delivering blanksseverally in succession to the zone between said fashioned end portionand said'holding member, means for advancing and retract ing saidholding member, a table-and a shaping tool carried thereupon, a pivotalsupport for said table transverse to said shaft and means for swinging.said table about such pivotal support a direction such as to cause saidshaping tool to sweep around the edge of a blank when l 1 between saidfashioned end portion and said holding member.

2. A machine for shaping a rounded edge on circular blanks comprising ashaft with anend portion fashioned .to fit against one face of each suchblank, a holding member adaptedto clamp'a blank against such fashionedend portion, means for rotating said shaft, means for delivering blanksseveraliy in succession to the zone between said fashioned end portionand said holding member, means for advancing and retracting said holdingmember, a-table and a-shaping tool carried thereupon, said shaping toolcomprising a grinding disc and means for driving the same, means formoving said table about an axis transverse to said shaft in a curvedpath such that the edge of said grinding disc sweeps across the edge ofa blank when gripped between said fashioned end portion and said holdingmember.

3. A machine for shaping circular blanks comprising a shaft with an endportion fashioned to fit against one face of each such blank, aholdingmember and means for pressingit with resilient pressure against a blankwhen applied to said fashioned endportion, means for rotating saidshaft, a guide member adapted to straddle said fashioned end portion, asupport for said guide member adapted to permit movement thereof backfrom said fashioned end portion, a spring adapted to return said'guidemember to its normal position over said fashioned end portion, means forfeeding said blanks one by one over the face of said guide member, atable and a shaping tool carried thereon, 'means for moving said tableabout an axis transverse to said shaft in a curvedpath such 'thattheedge of said tool sweeps across the edge: of such blank when clampedbetween said fashioned end portion and said holding member, and means:in

connection with the support for said tool adapted to press back saidguide member as said tool advances toward and over the edge of suchblank.

4. A machine for shaping circular blanks comprising a shaft with an endportion fashioned to fit against one face of each such blank, a holdingmember adapted to clamp a blank against such fashioned end portion,means for rotating said shaft, means for delivering blanks severally insuccession to the zone between said fashioned end portion and saidholding member, a shaping tool and a table therefor, means supportingsaid table in such manner that it can move in a direction to traversesaid tool across the plane of such blank when clamped as aforesaid, cammechanism adapted to retract said holding member and said table, andspring means for advancing said holding member and said table in thedirection in which said holding member and said shaping tool move intoengagement with such blank when clamped as aforesaid.

5. A machine for shaping circular blanks comprising a receptacle for theblanks and means for delivering said blanks one by one from saidreceptable, a guide member to which said blanks are delivered, a slideassociated with said guide member, a blade formed with spring fingersattached to said slide, a shaft having a fashioned end portion adaptedto fit against one face of each such blank said shaft being so disposedin relation to said guide member as to receive such blanks on itsfashioned end portion when delivered thereto by said guide member andsaid spring fingers, a holding member adapted to clamp such blanksagainst said fashioned end portion on said shaft, and means for shapingthe exposed surfaces of said blanks when held by said holding member andsaid fashioned end portion, in association with means for driving saidshaft, and means for operating said slide, said holding member and saidshaping means, said operating means comprising cams adapted to retractsaid slide, said holding member and said shaping means respectively, andsprings adapted to advance said slide in the direction for l 10 feedinga blank over the face of said fashioned end portion, to advance saidholding member toward said fashioned end portion on said shaft, and toadvance said shaping means towards such blank when clamped between saidfashioned end portion and said holding member.

6. A machine for shaping circular blanks comprising a shaft with an endportion fashioned to fit against one face of each such blank, a holdingmember adapted to press a blank against such fashioned end portion,means for rotating said shaft, a guide member adapted to straddle saidfashioned end portion, a pair of spring fingers and a slide supportingthe same adapted to move over said guide member toward and away fromsaid fashioned end portion, means for delivering blanks severally tosaid guide member and for traversing said slide and said spring fingersalong said guide member toward and away from said fashioned end portion,springactuated mechanism for moving said holding member toward saidfashioned end portion and between said spring fingers, positive meansfor withdrawing said holding member intermittently, a grinding member,and means for supporting and traversing said grinding member such as tocause said grinding member to move in a curved path about the edge ofsuch blank when clamped between said holding member and the fashionedend portion on said shaft.

VACLAV NACHAZEL.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 639,910 Shantz Dec. 26, 18991,713,257 Carris May 14, 1929 1,863,737 Witte June 21, 1932 1,892,363Raule Dec. 27, 1932 2,405,367 Nichols Aug. 6, 1946

